doc: add docs of createContractAddress

[jasonandjay]

Description

Added the documentation for createContractAddress just like #7418:

Included JSDoc comments directly in the function definition.

Type of change

• Documentation (changes that only address relatively minor typographical errors are not accepted)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run lint with success and extended the tests and types if necessary.
• I ran npm run test:unit with success.
• I ran npm run test:coverage and my test cases cover all the lines and branches of the added code.
• I ran npm run build and tested dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.
• I have linked Issue(s) with this PR in "Linked Issues" menu.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (fa5ce5b) to head (ae1936a).
Report is 1 commits behind head on 4.x.

Additional details and impacted files

@@           Coverage Diff           @@
##              4.x    #7421   +/-   ##
=======================================
  Coverage   94.54%   94.54%           
=======================================
  Files         218      218           
  Lines        8637     8637           
  Branches     2364     2364           
=======================================
  Hits         8166     8166           
  Misses        471      471           

Flag	Coverage Δ
UnitTests	94.54% <ø> (ø)

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[ayanwaar]

11d1416